net.beadsproject.beads.analysis.featureextractors

Class SpectralPeaks

java.lang.Object

net.beadsproject.beads.core.Bead

net.beadsproject.beads.analysis.FeatureExtractor<float[][],float[]>

net.beadsproject.beads.analysis.featureextractors.SpectralPeaks

public class SpectralPeaks
extends FeatureExtractor<float[][],float[]>

Peaks finds the strongest N peaks in a signal passed from a PowerSpectrum, where N is the specified number of features. Peaks must be set as a listener to a PowerSpectrum object to work properly. Its output is an array of [frequency, power] tuples.

Field Summary

Fields inherited from class net.beadsproject.beads.analysis.FeatureExtractor

featureDescriptions, features, name, numFeatures

Constructor Summary

Constructors

Constructor and Description
SpectralPeaks(AudioContext context) Instantiates a new Peaks.
SpectralPeaks(AudioContext context, int numFeatures) Instantiates a new Peaks with the given number of features.

Method Summary

Modifier and Type	Method and Description
float[][]	getFeatures() Gets the current features of type R, specified in the class def.
void	process(TimeStamp startTime, TimeStamp endTime, float[] powerSpectrum) Process some data of type P (specified by the class def).
void	setNumberOfFeatures(int numFeatures) Sets the number of features.

Methods inherited from class net.beadsproject.beads.analysis.FeatureExtractor

addListener, forward, getFeatureDescriptions, getName, getNumberOfFeatures, removeListener, setName

Methods inherited from class net.beadsproject.beads.core.Bead

getKillListener, isDeleted, isPaused, kill, message, messageReceived, pause, setKillListener, start, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SpectralPeaks

public SpectralPeaks(AudioContext context)

Instantiates a new Peaks.

Parameters:

context - the AudioContext.

SpectralPeaks

public SpectralPeaks(AudioContext context,
                     int numFeatures)

Instantiates a new Peaks with the given number of features.

Parameters:

context - the AudioContext.

numFeatures - the number of features.

Method Detail

process

public void process(TimeStamp startTime,
                    TimeStamp endTime,
                    float[] powerSpectrum)

Description copied from class: FeatureExtractor

Process some data of type P (specified by the class def). This method must be overidden by implementing classes.

Specified by:

process in class FeatureExtractor<float[][],float[]>

powerSpectrum - the data.

getFeatures

public float[][] getFeatures()

Description copied from class: FeatureExtractor

Gets the current features of type R, specified in the class def.

Overrides:

getFeatures in class FeatureExtractor<float[][],float[]>

Returns:

the features.

setNumberOfFeatures

public void setNumberOfFeatures(int numFeatures)

Description copied from class: FeatureExtractor

Sets the number of features.

Overrides:

setNumberOfFeatures in class FeatureExtractor<float[][],float[]>

Parameters:

numFeatures - the new number of features.